So it is necessary to find some ways for the fault location detection. In the phase-to-earth fault power system, the value of zero-sequence impedance is directly related to the earthconductivity.
这样就降低了供电可靠性，故找出一种新思路使其能更准确有效地判断故障点具有重要意义。
2
Studied the compound effect that boron and rare-earth improved the electric conductivity.
研究了硼与稀土在改善铝导体导电性方面的复合作用问题。
3
The molar conductivity of rare earth chlorid increases with the decreasing of concentration.